焙烧“解毒”石棉尾矿制备免烧砖及机理研究  

Study on Preparation and Mechanism of Roasting"Detoxification"Asbestos Tailings Free Brick

作　　者：周鑫 孙红娟[1,2] 彭同江[1,2,3] Zhou Xin;Sun Hongjuan;Peng Tongjiang(Key Laboratory of Solid Waste Treatment and Resource Recycle,Ministry of Education,Mianyang,Sichuan 621010;Institute of Mineral Materials and Application,Southwest University of Science and Technology,Mianyang,Sichuan 621010;Analytical and Testing Center,Southwest University of Science and Technology,Mianyang,Sichuan 621010)

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室,四川绵阳621010 [2]西南科技大学矿物材料及应用研究所,四川绵阳621010 [3]西南科技大学分析测试中心,四川绵阳621010

出　　处：《非金属矿》2022年第5期26-29,共4页Non-Metallic Mines

基　　金：国家自然科学基金(42072048)。

摘　　要：以石棉尾矿为原料,将焙烧“解毒”后的石棉尾矿与水泥混合,采用压制成型法制备免烧砖,研究了物料配比、拌和水用量及成型压力对免烧砖抗压强度的影响。结果表明,当水泥掺量为“解毒”后石棉尾矿质量的14%,拌和水用量为12%,成型压力分别为20 MPa和25 MPa时,制备的免烧砖抗压强度分别为10.03 MPa和15.86 MPa,满足GB/T 5101-2017《烧结普通砖》中MU10和MU15强度等级要求。微观分析表明,水泥水化产物主要为硅酸钙凝胶与钙矾石,水化产物填充在免烧砖样品内部空隙中,形成致密的网状结构,从而提高免烧砖的强度。Taking asbestos tailings as raw material,the asbestos tailings after roasting and"detoxification"were mixed with cement,and bakingfree bricks were prepared by pressing forming method.The effects of material ratio,mixing water dosage and forming pressure on the compressive strength of baking-free bricks were studied.The results show that when the cement content is 14%of the quality of"detoxification"asbestos tailings,the amount of mixing water is 12%,and the molding pressure is 20 MPa and 25 MPa,the compressive strength of the baking-free bricks can reach 10.03 MPa and 15.86 MPa respectively,which meet the strength grade requirements of MU10 and MU15 in GB/T 5101-2017"Fired common bricks".Microcosmic analysis shows that cement hydration products are mainly calcium silicate gel and ettringite.Hydration products fill the internal voids of baking-free brick samples to form a dense network structure,thus improve the strength of baking-free brick.

关 键 词：石棉尾矿 焙烧“解毒” 免烧砖 抗压强度 水化机理 

分 类 号：X75[环境科学与工程—环境工程]